feat(listening): interactive listening comprehension trainer with neural voiceover and auto-evaluation

app/static/js/modules/api.js

@@ -183,6 +183,29 @@ export const api = {
         }
     },
 
+    // Listening Comprehension Trainer
+    listening: {
+        async getExercise(topic = 'all', level = 'B1') {
+            const resp = await fetch(`/api/listening/exercise?topic=${encodeURIComponent(topic)}&level=${encodeURIComponent(level)}`);
+            if (resp.ok) return await resp.json();
+            throw new Error(`Failed to load listening exercise: ${resp.status}`);
+        },
+        async checkAnswer(scenarioId, userAnswer, story = '', idealAnswer = '') {
+            const resp = await fetch('/api/listening/check', {
+                method: 'POST',
+                headers: { 'Content-Type': 'application/json' },
+                body: JSON.stringify({
+                    scenario_id: scenarioId,
+                    user_answer: userAnswer,
+                    story: story,
+                    ideal_answer: idealAnswer
+                })
+            });
+            if (resp.ok) return await resp.json();
+            throw new Error(`Failed to check listening answer: ${resp.status}`);
+        }
+    },
+
     // Bookshelf & Reader
     books: {
         async getAll() {